Filter-press.



N0. 672,505. Patented Apr. 23, |9l. J. CRTCHLW.

FILTER PRESS.

(Amication filed Apr. 3 0, 1900.)

4 Sheets-Sheet 24.

(No Model.)

PatentedApr. 23, |901. J. CRITCHLGW.

FILTER PRESS.

(Application filed Apr. 30, 1900.)

(No Model.)

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J. CRITCHLOW FILTER PRESS,

- u Application lod Apr. 30. 1900.)

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FILTER-nl PRESS.

SPECIFICATION, forming part of Letters Patent No. 672,505, dated April 23, 1901.

Application iled April 30, 1900. Serial No. 14,946. (No model.)

To all whom, t may concer-n:

Be it known that I, JOHN CRITcHLow, engineer, a subject of the Queen of Great Britain and Ireland, residing at 3 Campbell road, Stoke-upon-Trent, in the county of Stafford, England, have invented certain new and useful Improvements in. and Applicable to Filter- Presses, of which the following is a specification.

The invention relates to improvements in and applicable to filter-presses for potters use, the objects being to construct a press of a lighter character than hitherto,one in which the trays can be readily moved backward and forward, and in general a press designed to attain better filtration of the slip and a greater output of such, while at the same time economizing both time and labor.

The improvements comprise means for moving the trays backward and forward on their supporting-frame from either end of the latter, means for rapidly forcing up and withdrawing the movable press-head, and means for increasing the pressure of the movable head when up against the trays, and sundry other detail improvements, all of which will be hereinafter referred to.

The invention will be fully described with reference to the accompanying drawings, in which- Figure l is a side elevation of a lter-press of the class referred to with my improvements applied; Fig. 2, a plan of same; Fig. 3, an end elevation; Figs. e and 5, detail views of the screw and holding arrangement for the screw for forcing the trays together; Fig. 6, an enlarged end elevation, partly in section, of the means for moving the trays backward and forward; Figs. 7 and 7, side elevation and section of an improved filter-tray, and Fig. 8 a side elevation of improved plate for filter-tray. Figs. 9 and l0 show front and sec-tional views of the filter-cloths. Figs. ll and l2 are enlarged detail views of the catches.

Referring principally to Figs. l to 3 and 6, d is the ordinary framing of the iilterpress. h represents the lter-trays, c the stationary head, and d the movable head. Each of the trays has formed on or fixed at each side a projecting arm b', in which is journaled a small roller d', the rollers resting upon the longitudinal side frames. Similar above the main frame aasubsidiary frame e of a suitable character,but always having two side rails c parallel with each other and with the frame d. Upon the rails e] I mount a light carriage f,the latter being su pported by wheels f and prevented from getting askew by similar wheels g, that bear against the inner sides of the rails e. The carriage is free to be moved backward and forward on the rails e by means of handles attached to or formed on it. form shown, as represented by g', in which they consist of bars h, passed through and secured to the carriage f by nuts. The lower ends of the bars 71 have pivoted to them swiveling catches h h", which maybe locked by At present I arrange the handles in the wedges or ins h" so as to swivel in one direction only and remain rigid or in line with the bar h in the other. Thus assuming the carriage f in Fig. l was moved to the left, the catches h' being previously lifted up, catches h coming in contact with the arms b" would ride over them and having passed drop down behind one or more ofthe latter. On moving the carriage in the reverse direction the catches remain rigid and move the trays toward the movable head of the press, so that the filtered slip can be removed from them in the usual way. To bring the trays together againprior to a pressing and filtering operation, the pins or wedges are placed at the opposite sides of the bars h.

By means of the arrangement described the trays b can be readily and quickly moved about quite parallel to the face of the movable and stationary heads of the press by one man or boy, thus economizing labor and in! creasing the production of the press.

In presses hitherto in use the movable head has been moved forward or withdrawn from the trays h by means of a screw only, thus making the operation a long one. To obvi- IOO ate this, I employ means whereby the head can be moved very rapidly in either direction. These means are indicated in Figs. l, 2, Ll, and 6, the latter being in section. Referring to these, t' is a central shaft coupled at its inner' end to the boss CZ" of the head d, but capable of revolving therein. The outer end of the shaft passes through a boss in the end frame a. and carries a wheelj, fixed to it, and near the Wheel the shaft is screwed for a portion of its length, such screwed portion engaging with a chased threadformed inthe end of a sleevej, surrounding the shaft, the sleeve having a sliding fit in the hole of frame a'. The outer end of the shaft 'l is supported by a bush or gland t", fitted in the stud passed loosely through a bracket n, carframe ct. On the under side the sleevej' is provided with rack-teeth, with which a pinion Za engages. The latter is mounted ona vshaft k', carried in bearing-brackets'beneath the side frames ofv the machine and is pro- .vided at one or both ends with squared shoulders or wheels or levers by means of which it' the head d has'been moved' forward, I form' the sleevej' with grooves j", as shown more clearly in Fig. 5. These grooves are just in'- side the framing (see Fig. 2) when the head d is'against the-trays b, andfin order that" itV may be held in this position I provide a horseshoe-shaped stop Z, which is hung from a lever Z', carried by a bracket attached t'o the frame a of the machine. The stop Z holds the screw from moving endwise and also prevents it turning around. The further pressureisnow l applied'by means of the Wheelj, which is provided'on one of its faces with holes fm, into which a lever may be inserted for the purpose of turning the wheel around and the shaft on whichitismounted; Theshaftisthusscrewed through the sleeve and pressure put on the trays.' When sufficient pressure is not obtained in this Way, I may use additional means to put on the final pressure. may consist of a pinion n, fixed on a short riedlby the framing a. The front end of the pinion is arranged so that a Winch handle or leverot may be easily placed thereon. By these means further purchase may be obtained'on the central shaft t'. As the stud on which the pinion n is mounted' is capable of moving endwise it can be brought into gear with the wheelj as andwhen required or be disengaged therefrom. It will thus be seen that the mechanism described provides very ready means for rapidly applying pressure to the trays b and for increasing such pressure, as required. It should be said that the stop Z receives the end pressure and transmits it to the end frame 0], and that prior to opening out the trays it is lifted and held outof These means L contact with the sleeve j by means of the lever to which it is coupled;

A further part of my invention relates to an improved construction of filter-tray. This is indicated inl Figs. '7 and 8, the former being jaA side elevation of a complete tray and the lattera similaiview of the plate. I make the central plate o of a non-corrosive cast,stamped, =or rolled metal sheet, grooved in the usual manner. The plate is formed on each side with slots to take the heads of one or more bolts or studs' o", screwed aty their outer ends and passed through holes in a Wooden framework p, which is internally provided with grooves to admit the edges of the plate. The frame p and plateo are rigidly heldtogether by nuts on the bolts o'. The grooves inthe plates 0 on one side are opposite to the projections on the other side and are arrangedlto `extend from the under edge ofthe top part of the frame p to within a short distance of the upper edge ofthe bottom portion of the frame.

In referring to a' further detaili improvement I should say `that the filter-cloths have been generally sewed together around the slip-hole, a method which leaves the edge of the hole somewhat irregular. I also sew them together around the slip-hole q, Figs. 9 and 10, but with this difference-namely, a metal ring q is securely fastened in the sewing, thereby preserving the cl'earness'of thehole andl enabling the slip to pass more readily therethrough.

Inconcl'usion I would have it understood `that the details of construction may be departed from without affecting the spirit of the invention and that all the parts maybe Qmade` of any material' suitable for the purl pose. y

What I claim as my invention, and desire ltoprot'ect by Letters Patent, isl. In a filter-press for potters useasubsidi- Iary frame rising above the main frame, rails located on saidv subsidiary frame, a carriage g movable backward andforward on saidfrails, larms projecting downwardly from the cari riage and provided with pivoted catches substantially as and forthe purposes described. p 2. In a filter-press for potters use the means for putting pressure on the filter-trays consisting in a shaft coupled to the movable head of the press at one end and carrying a wheel iat the other, a screw-thi'ead formed on said shaft, a sleeve surrounding the shaft and provided with aV threadengagingwith'the thread on the shaft and externally with' rack-'teeth and with grooves at one end, a rotatable pin'- ion mounted on a shaft and engaging with rack-teeth on sleeve, an embracing stopengaging with grooves irr sleeve and frame for supporting the mechanism substantially as described.

3. In a filter-press, a frame, a stationary head and a movable head mounted thereon, a shaft coupled to the movable head, a sleeve threaded on said shaft and slidably mounted in the frame, rack-teeth formed on the sleeve,

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a wooden frame surrounding said plateend bolts for securing the plate to the frame substantially as described.

6. In lter-cloths for filter-presses the combination therewith of metal rings sewed thereinto to form the slip-hole substantially as de scribed.

In Witness whereof I have hereunto set my hand in the presence of two witnesses.

JOHN CRITCHLOW. Witnesses:

WILLIAM H. TAYLOR, JAs. STEWART BRoADFooT. 

